There is a difference between swallowing your words and sparing your words.
Swallowing your words happens after you say the words. Sparing your words happens before they come out.
Even a fool look’s wise in his silence. Looking in Prov 17:27-28
He that hath knowledge spareth his words: and a man of understanding is of an excellent spirit.
In Jas 1:19, we are told to be swift to hear, slow to speak.
In wisdom: Spare Your Words.